If you collect super rare error cards I have a 1990 Score wrong back pair of Craig Biggio/Bo Jackson. I have owned these 2 cards since they left the factory. They are cards #275 Biggio and #280 Jackson. The card with the Biggio front and the Jackson back is the Watham version.
Let me know if you have any interest in them I can send pics and/or a video of me flipping the cards over to show the error.
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